Swift – How to decode a JSON path that looks like this 0.lat

I would like to get the position data of a city from the openweathermap Geocoding API
But I have a problem with there Json struct and that the path starts with a 0

like this: 0.lat

here is an example of the JSON I get back

[
  {
    "name": "Osimo",
    "local_names": {
      "ru": "Озимо",
      "fr": "Osime",
      "it": "Osimo"
    },
    "lat": 43.4861359,
    "lon": 13.4824068,
    "country": "IT",
    "state": "Marche"
  }
]

And this is my code. I found CodingKey when I was looking up the problem but it doesn’t work in my code or I did made a mistake.

PositionData.swift

enum CodingKeys: String, CodingKey {
    case zero = "0"
}
struct PositionData: Decodable {
        let zer0: Zero
    }

struct Zero: Decodable {

But when I would like to code the path it tells me that: Value of type ‘PositionData’ has no member ‘0’

LocationManager.Swift

do {
            let decodedData = try decoder.decode(PositionData.self, from: positionData)
            print(decodedData.0.lat)
        } catch {
            print("Error in Json")

I tried to load the position data of the openweathermap Geocoding API.
Now I am not sure how to decode the JSON data with a path like this 0.lat

>Solution :

There is no the path starts with a 0.

You have to decode an array and get the item at index zero

do {
    let decodedData = try decoder.decode([PositionData].self, from: positionData)
     print(decodedData[0].lat)  // better print(decodedData.first?.lat)
} catch {
    print(error) // NEVER print a literal like ("Error in Json")
}

and delete

enum CodingKeys: String, CodingKey {
    case zero = "0"
}
struct PositionData: Decodable {
        let zer0: Zero
    }

struct Zero: Decodable {

PositionData must look like

struct PositionData: Decodable {
    let lat, lon: Double
    // ...
}